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The scientists included photos of the volunteers' partners and brothers, which they had also sent in.

What the researchers found was "clear evidence for perceptual similarity in facial photographs of a woman's partner and her brother."

Taking brotherly love to new levels

"[Our findings] were not a rule or true of every woman but we do find that, at levels greater than chance, partners did show some subtle resemblance to the women's brothers," Lead researcher Tamsin Saxton told The Independent .

Tamsin also suggested "familiarity seems to be attractive", meaning people are attracted to those with similar views, interests and tastes, in which case "maybe that is something that is coming into play."